After an indefinite length of time, the symptoms return with greater severity. These remissions and aggravations may be repeated several times, each successive remission being less perfect, each recurrence more severe, carrying the patient further down the road toward the "dark valley." Now the cough increases, the paroxysms become more severe, the expectoration more copious and purulent, as the tubercular deposits soften and break down. The voice is hollow and reverberating, the chest is flattened, and loses its mobility; the collar-bones are prominent, with marked depression above and below. Auscultation reveals a bubbling, gurgling sound, as the air passes through the matter in the bronchi, with the click, to the air cells beyond. Percussion gives a dull sound or if there are large cavities, it is hollow, and auscultation elicits the amphoric sound, as of blowing into a bottle. Hectic fever is now fully established; the eye is unusually bright and pearly, with dilated pupils, which gives a peculiar expression; the paroxysms of coughing exhaust the patient, and he gasps and pants for breath. The tongue now becomes furred, the patient thirsty, the bowels constipated, and all the functions are irregularly performed. Another remission may now occur, and the patient be able to resume light employment, for an indefinite length of time, which we have known to extend over three or four years, when the symptoms again return.
If the patient is a female, and deranged or suppressed menstruation has not marked the accession of pulmonary symptoms, the flow now becomes profuse and clotted, or is scanty and colorless, sometimes ceasing altogether. In the male, the sexual powers diminish, and copulation is followed by excessive and long-continued prostration. From this time onward, the progress of the disease is more rapid. The liver and kidneys are implicated. In addition to the pallor, the complexion becomes jaundiced, giving the patient, who is now wasting to a mere skeleton, a ghastly look. The urine is generally copious and limpid, though occasionally scanty and yellow. The pulse increases to one hundred and thirty or one hundred and forty beats in the minute, and is feeble and thread-like. The cough harasses the patient so that he does not sleep, or his rest is fitful and unrefreshing; whenever sleep does occur, the patient wakes to find himself drenched with a cold, clammy perspiration. The throat, mouth, and tongue now become tender, and occasionally ulcerate. Expectoration is profuse, purulent, and viscid, clinging tenaciously to the throat and mouth, and the patient no longer has strength to eject it. The hair now falls off, the nails become livid, and the breathing difficult and gasping; the patient has no longer strength to move himself in bed and has to be propped up with pillows, and suffocates on assuming the recumbent position. Drinks are swallowed with difficulty. Diarrhea takes the place of constipation. The extremities are cold, swollen, and dropsical; the voice feeble, hollow, grating, husky, the patient gasping between each word; the respiration is short and quick. A slight remission of these symptoms occurs. The patient is more comfortable, lively, cheerful, and perhaps forms plans for the future. But it is the last effort of expiring vitality, the last flicker of the lamp of life, the candle burns brilliantly for a moment, and with one last effort goes out, and death closes the scene.
The duration of the active stage of consumption varies from a few weeks to several years, the average time being about eighteen months.
Cough is always a prominent symptom throughout the entire course of the disease, varying with its progress.
Expectoration, at first scanty, then slightly increased, colorless, frothy, and mucous, is also a characteristic. After a time it becomes opaque, yellow, and more or less watery; then muco-purulent and finally purulent, copious, and viscid. When tubercular matter is freely expectorated, with but little mucus, it sinks in water. This symptom continues to the very last.
Hæmoptysis (bleeding from the lungs) may occur at any stage of the disease, often being the first pulmonary symptom noticed, again being delayed until late; and there are cases in which it does not happen at all. It seldom occurs in any other disease.
Night-sweats may occur at any stage, though they are rarely experienced until the disease is pretty well established, and are very exhausting.
Hectic Fever generally occurs soon after the pulmonary symptoms are developed, and increases in intensity with the progress of the disease. There are usually two paroxysms in twenty-four hours, one of which occurs towards evening and is followed by night-sweats.
Dyspnoea (difficult breathing) is at first slight, except after exertion, amounting to only a sense of oppression; but it becomes more and more severe as the disease advances, until the very last, when it is agonizing in the extreme.
Aphthæ, sometimes extending to the pharynx and larynx, generally occurs towards the last. The mouth and throat become so very sore and tender that nourishment and medicine are taken with difficulty.